…It usually occurs involuntarily and cannot be stopped consciously. Nystagmus is broadly divided into pendular nystagmus, which has equal forward and backward movements, and saccadic nystagmus, which is different, and is called horizontal, vertical, rotational, etc. depending on the direction of the movement. Nystagmus is related to the functions of the eyes, inner ear, brain stem, and cerebellum, and can occur even in healthy people when hot or cold water is poured into the ear (thermal nystagmus) or when looking at the scenery outside from a train window (railroad nystagmus), and these are called physiological nystagmus. … *Some of the terminology that mentions "pendular nystagmus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ふつうは不随意に起こり,意識的に止めることはできない。眼振は往きと帰りの運動が等しい振子様眼振pendular nystagmusと,異なる衝動性眼振saccadic nystagmusに大別され,また振れる方向によって,水平,垂直,回旋などの名称をつけて呼ばれる。眼振には眼,内耳,脳幹,小脳の機能が関係していて,健康者でも,温水や冷水を耳に注入したとき(温度性眼振)や電車の窓などから外の景色を見ているとき(鉄道眼振)などに起こり,これらは生理的眼振と呼ばれる。… ※「pendular nystagmus」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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